Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-07-30T18:32:11 activestorage: Active Storage: Remote Code Execution via Unsafe libvips Operations 8.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L CWE-434

Action Pack is a framework for handling and responding to web requests. In versions prior to 7.2.3.2, 8.0.5.1 and 8.1.3.1, Active Storage does not disable libvips operations marked unsafe for untrusted content, allowing a crafted upload to invoke such an operation. Consuming applications are affected when configured to use libvips and accept image uploads from untrusted users. An unauthenticated attacker may exploit this behavior to read arbitrary files accessible to the Rails process, including environment variables and application secrets. Exposure of credentials such as secret_key_base or external-service tokens may enable remote code execution or lateral movement. This issue has been fixed in versions 7.2.3.2, 8.0.5.1 and 8.1.3.1.

A flaw was found in Active Storage, a component of Action Pack. An unauthenticated attacker can exploit this vulnerability by crafting a malicious file upload. This allows the attacker to invoke unsafe `libvips` operations, leading to the ability to read arbitrary files on the system including sensitive environment variables and application secrets. The exposure of these credentials could enable remote code execution or lateral movement within the affected system.

This Important flaw in Active Storage allows unauthenticated remote attackers to read arbitrary files and potentially achieve remote code execution. This occurs in applications configured with `libvips` as the Active Storage variant processor (a default since Rails 7.0) that accept untrusted image uploads. Red Hat Satellite: The Active Storage engine is explicitly commented out and disabled at runtime across all Satellite/Foreman builds. Furthermore, libvips dependencies are not shipped marking Red Hat Satellite as Not Affected. Red Hat 3scale: Neither the libvips binary nor its shared libraries are present in any 3scale container image, hence 3scale product is not affected. Red Hat 3scale API Management Platform 2 Not affected 3scale-amp20/system Red Hat 3scale API Management Platform 2 Not affected 3scale-amp21/system Red Hat 3scale API Management Platform 2 Not affected 3scale-amp21/zync Red Hat 3scale API Management Platform 2 Not affected 3scale-amp22/system Red Hat 3scale API Management Platform 2 Not affected 3scale-amp22/zync Red Hat 3scale API Management Platform 2 Not affected 3scale-amp24/system Red Hat 3scale API Management Platform 2 Not affected 3scale-amp24/zync Red Hat 3scale API Management Platform 2 Not affected 3scale-amp25/system Red Hat 3scale API Management Platform 2 Not affected 3scale-amp25/zync Red Hat 3scale API Management Platform 2 Not affected 3scale-amp26/system Red Hat 3scale API Management Platform 2 Not affected 3scale-amp26/zync Red Hat 3scale API Management Platform 2 Not affected 3scale-amp2/system-rhel7 Red Hat 3scale API Management Platform 2 Not affected 3scale-amp2/system-rhel8 Red Hat 3scale API Management Platform 2 Not affected 3scale-amp2/system-rhel9 Red Hat 3scale API Management Platform 2 Not affected 3scale-amp2/zync-rhel7 Red Hat 3scale API Management Platform 2 Not affected 3scale-amp2/zync-rhel8 Red Hat 3scale API Management Platform 2 Not affected 3scale-amp2/zync-rhel9 Red Hat Satellite 6 Not affected rubygem-activestorage Red Hat Satellite 6 Not affected satellite:el8/rubygem-activestorage https://www.cve.org/CVERecord?id=CVE-2026-66066 https://nvd.nist.gov/vuln/detail/CVE-2026-66066 http://www.openwall.com/lists/oss-security/2026/07/29/9 https://github.com/rails/rails/commit/1c01bb587206ee6eb0e1179c2cef96a6a47acb1e https://github.com/rails/rails/commit/349e7a5d5b4b715af1e416db824f3c078a7d59e5 https://github.com/rails/rails/commit/d79b7f4aa17dec8ce4960fef05733c8c0c7ef49a https://github.com/rails/rails/releases/tag/v7.2.3.2 https://github.com/rails/rails/releases/tag/v8.0.5.1 https://github.com/rails/rails/releases/tag/v8.1.3.1 https://github.com/rails/rails/security/advisories/GHSA-xr9x-r78c-5hrm https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-66066.yml https://thehackernews.com/2026/07/critical-rails-flaw-could-let.html